Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
  • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
  • G03F7/004—Photosensitive materials
  • G03F7/016—Diazonium salts or compounds
  • G03F7/021—Macromolecular diazonium compounds; Macromolecular additives, e.g. binders

Definitions

• This invention relates to radiation sensitive materials suitable for use in the manufacture of photoresists, and more particularly lithographic printing plates.
• Such radiation sensitive materials have to satisfy various parameters. Thus they should be as sensitive as possible to radiation, be soluble in a suitable coating solvent, be stable when coated on a substrate and stored for long periods, have good solubility difference (in a developer which is preferably aqueous-based) between the unexposed and exposed states, adhere well to the substrate, and be oleophilic and tough in the image forming areas.
• Diazo materials are well known to satisfy many of the above parameters and their use is well documented in the patent literature. Reference may be made to GB Patent Specifications Nos. 954 761, 1 019 919, 1 023 589, 1 055 079, 1 302 717, 1 312 925 and 1 388 038 and to European Patent Specification No. 30862.
• a radiation sensitive compound which comprises a polymer including a plurality of structural units represented by the formula: ##STR4## in which, R represents H or CH 3 ; each R 1 , which may be the same or different represents H or alkyl; R 2 represents a single bond or a substituted or unsubstituted divalent radical; Ar represents a substituted or unsubstituted divalent radical derived from an aromatic or heteroaromatic compound; X represents O, S or NH; A represents an anion; Y represents a carbonyl oxy or aromatic radical; and n is an integer greater than or equal to 1.
• R 2 and Ar may be any of the radicals specified in EP-A-30862 under the designation R and Ar, respectively.
• Ar may be phenylene, naphthylene or benzothiazolylene. It may include substituent groups such as alkyl, aryl, alkoxy, aryloxy, dialkylamino, arylmercapto, halogeno, nitro or carboxy.
• the substituent may confer extra light sensitivity.
• it may be or may contain a diazo, azido or styryl group.
• Advantages in terms of stability and light sensitivity are conferred by a substituent amino or arylmercapto group in the para position to the main diazo group.
• the stability may be further increased by introduction of an additional substituent, such as an alkoxy group, ortho to the diazo group.
• the radical R 2 may be, for example, substituted or unsubstituted alkylene, arylene, or a combination thereof.
• the radical may contain one or more heteroatoms providing groupings such as are shown by formulae 2 to 11.
• the radical R 2 may contain one or more diazo groups and may be typified by the structure
• R 3 provides a link with moieties containing the other diazo group in which case it may be ethylene, phenylene, succinoyl bis oxy ethyl, methylidene amino or N,N-2,4-toluene bis carbamoyloxyethyl or it may be a single bond when the moiety is a p-diazophenyl group.
• the anion A - may be p-toluene sulphonate, naphthalene sulphonate, dodecyl benzene sodium sulphonate, dicyclohexylsulphosuccinate, di octyl sulphosuccinate, triisopropyl naphthalene sulphonate, diisobutyl naphthalene sulphonate 2-hydroxy 4 methoxy benzophenone-5-sulphonate, mesitylene sulphonate, octyl phenyl sulphonate, lauryl sulphate, naphthoate, cinnamate, tetrafluoroborate, hexaflurophosphate or reineckate.
• the polymer may include units derived from one or more monomeric compounds containing an unsaturated group.
• Examples of such monomeric compounds include any mono (meth)acrylate, (meth)acrylamide, maleic anhydride, allyl compound, vinyl compound, styrene compound, acrylonitrile compound, itaconate, or crotonate.
• said monomeric compounds are selected from methyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, butyl (meth)acrylate, (meth)acrylic acid or an isocyanato alkyl (meth)acrylate, the isocyanato group of which has been reacted with a compound which may be selected to enhance the properties of the final product, for example, increased solubility, increased oleophilicity or increased strength.
• This enhancing compound may be, for example, an alcohol, a phenol, an aromatic or aliphatic amine, or a mercapto compound.
• the compounds of the invention may be prepared by:
• the compound of step (i) is co-polymerised with one or more monomer compounds containing an unsaturated group and no hydroxy or amino functionality.
• step (ii) the homopolymer or copolymer is reacted additionally with a compound which has a group capable of reacting with the isocyanate groups of the polymer and which enhances the property of the final product as referred to above.
• the compounds of the invention may be prepared by
• the product of step (i) is copolymerised with one or more compounds containing an unsaturated group.
• a compound containing a diazo group precursor i.e. a group capable of being converted to a diazo group
• a compound containing a diazo group precursor i.e. a group capable of being converted to a diazo group
• protected amines such a p-(N-ethyl-N-hydroxyethyl) amino acetanilide; 2,5-diethoxy-4-aminoacetanilide; and 6-chloracetyl-amino-5-methoxy-2-mercaptobenzothiazole,
• nitro compounds such as 2,5-dimethoxy-4-nitroaniline and 2-bromo-6-hydroxy ethoxy-4-nitro-N, N-dipropylaniline, and
• azo compounds such as 4-phenylazo-1-naphthyl amine and 4-[N,N-Bis( ⁇ -hydroxyethyl) amino]azobenzene.
• NMP N-methyl pyrrolidone
• Weight average molecular weights of the homopolymers were 20,000-25,000 measured by GPC (gel permeation chromatography) using a poly(IEM)-methanol standard.
• EHAA p-(N-ethyl-N-hydroxyethyl)aminoacetanilide
• the hydrolysed polymer solution was cooled to below 5° C. (ice-water bath) and a solution of sodium nitrite (8.3 g) in water (40 ml) was added portionwise, keeping the temperature below 5° C. The mixture was stirred for 1 hour at 1°-2° C., and then excess nitrite was destroyed by the addition of the necessary amount of sulphamic acid.
• a di-isobutyl naphthalene-1-sulphonic acid (DBSA) paste (68 g) was dissolved in water (3 liters) and the diazo polymer solution was poured in slowly with vigorous stirring. The precipitated polymer was collected by filtration, washed with copious amounts of cold water and dried in vacuo at room temperature.
• DBSA di-isobutyl naphthalene-1-sulphonic acid
• Example 1 was repeated except that instead of EHAA in Stage B, 2,5-diethoxy-4-amino-acetanilide (28.1 g) and 6-chloracetylamino-5-methoxy-2-mercaptobenzothiazole (34.0 g) respectively were used.
• the resultant compounds had similar properties to those of the compound of Example 1.
• a 56 ml portion of the IEM-EHAA solution obtained from Stage A was diluted with NMP (15 ml) and was heated to 95° C. under nitrogen.
• a solution of AIBN (0.1 g) in NMP (5 ml) was added over 5 min., and then the mixture was stirred for 4 hours.
• a further charge of AIBN (0.1 g) in NMP (5 ml) was made and stirring was continued for a further 2 hours.
• the resultant polymer solution was added to refluxing conc. H 2 SO 4 (24 ml) in water (200 ml). Reflux was maintained for 2 hours and the resultant hydrolysed solution was cooled.
• the hydrolysed polymer solution was cooled further, in a flask, by the addition of ice (300 g). With the flask immersed in an ice bath, a solution of sodium nitrite (5.3 g) in water (25 ml) was added with stirring. After 1 hour at 0°-3° C., excess nitrite was destroyed with sulphamic acid.
• NMP 60 ml was heated to 95° C. (oil bath) under a nitrogen atmosphere and a solution containing methyl methacrylate (7.0 g), IEM (3.1 g), lauryl methacrylate (2.5 g), AIBN (0.78 g) and NMP (10.9 ml) was added dropwise over 2 hours. A further 2 hour period at 95° C. was allowed after completing the additions. The polymer solution was then cooled to 20° C. The weight average molecular weight of the terpolymer was 4400 measured by GPC using a polystyrene standard
• the polymer solution was added slowly to a refluxing solution of H 2 SO 4 (8 g) in water (50 ml) in a flask. After initial frothing and the precipitation of some solid, a clear solution formed which gradually became dark in colour. Refluxing was continued for 21/2 hours, the temperature varying between 95°-105° C., and then the flask was cooled to room temperature.
• the polymer solution was cooled by the addition of ice (100 g), and then immersed in an ice bath. With the temperature at 0° C., sodium nitrite (1.66 g) in water (8 ml) was added with stirring. After 1 hour, excess nitrite was destroyed by the addition of sulphamic acid.
• DBSA paste (14.5 g) was dissolved in water (750 ml) and cooled to 10° C.
• the diazo solution obtained from Stage C was slowly poured in (1-2 min.), and after warming gradually to 25° C., the polymer coagulated. It was allowed to settle, collected by filtration, and washed with 2 liters of cold (10° C.) water. A light brown powder was obtained which was dried in a vacuum desiccator for three days. Yield 16.3 g.
• the resulting copolymer solution was refluxed with a mixture of conc. H 2 SO 4 (14 ml), water (85 ml) and NMP (100 ml) for 3 hours. The mixture was then cooled below 5° C. by the addition of ice-water (900 g). IR and NMR spectroscopy again showed that there had been no hydrolysis of the methacrylate groups.
• the diazotised copolymer solution was poured into a solution of DBSA paste (21.3 g) in water (1000 ml) at 10° C. with vigorous stirring. The precipitate was allowed to coagulate at 40° C. and then was collected by filtration, washed with copious amounts of water (10° C.) and dried in vacuo. Yield 20 g.
• NMP 50 ml was heated to 95° C. (oil bath), under an atmosphere of nitrogen, and a solution containing methyl methacrylate (6.0 g), IEM (4.7 g), lauryl methacrylate (2.5 g) and AIBN (0.78 g) in NMP (10.5 ml) was added dropwise over 2 hours. The solution was then stirred at 95° C. for a further 2 hours, and was then cooled to room temperature.
• EHAA (4.0 g), sufficient to react with 2/3 of the available isocyanate groups in the terpolymer, was dissolved in NMP (15 ml) and 1 drop of dibutyl tin dilaurate was added. The terpolymer solution was added to this solution, at room temperature, and the mixture was stirred for 11/2 hours. In order to effect conversion of the remaining isocyanate groups, a solution of 4-aminophenylacetic acid sodium salt (1.7 g) in NMP (10 ml) was added quickly and the mixture was stirred at 40°-50° C. for 2 hours.
• the polymer solution was added to a refluxing solution of conc. H 2 SO 4 (12 g) in water (75 ml) over 5 min. Reflux was maintained for a further 21/2 hours to effect hydrolysis.
• the hydrolysed polymer solution was cooled by the addition of ice (10 g) and was then immersed in an ice bath. With the temperature at 0°-3° C., sodium nitrite (1.66 g) in water (8 ml) was added with stirring. After 1 hour, excess nitrite was destroyed by the addition of sulphamic acid.
• the solutions were whirler coated onto grained and anodised aluminium and the resulting radiation sensitive plates were dried in an oven at 100° C. for 2 min.
• the plates were then imagewise exposed beneath a continuous tone step-wedge in a vacuum frame and developed with an aqueous solution containing 10% anionic surfactant and 2% benzyl alcohol to obtain lithographic printing plates.
• IEM is isocyanato ethyl methacrylate
• MM is methyl methacrylate
• MAA is methacrylic acid
• LM is lauryl methacrylate
• SM is stearyl methacrylate.
• Polymers containing pendant carboxylic acid groups showed improved development characteristics when incorporated in printing plates.
• the carboxylic acid groups in polymer No. 14 are derived from the amino acid used in Stage B
• polymer No. 8 gave a plate which showed a residual stain after development.
• polymer No. 14 afforded a plate which showed no residual stain.
• Meta-isopropenyl - ⁇ , ⁇ -dimethyl benzyl isocyanate (m-TMI) monomer was dried by distillation over calcium hydride under nitrogen in vacuo immediately before use. Methylene chloride was refluxed over P 2 O 5 for 1 hour, and then was distilled.
• the polymer obtained in Stage A was redissolved in dry NMP (60 ml) and was added to a solution of p-(N-ethyl-N-hydroxyethyl)aminoacetanilide (EHAA) (26.2 g) in NMP (100 ml). The mixture was heated to 50° C. with stirring. The temperature was maintained until IR spectroscopy showed that no free isocyanate remained (4-5 hours).
• EHAA p-(N-ethyl-N-hydroxyethyl)aminoacetanilide
• the hydrolysed polymer solution was cooled below 5° C. (ice-water bath) and a solution of sodium
• nitrite (8.3 g) in water (40 ml) was added. The mixture was stirred for 1 hour at 1°-2° C., and then excess nitrite was destroyed by the addition of sulphamic acid.
• DBSA Di-isobutyl naphthalene-1-sulphonic acid
• Example 8 was repeated except that instead of EHAA in Stage B, 2,5-diethoxy-4-amino-acetanilide (28.1 g) and 6-chloroacetylamino-5-methoxy-2-mercaptobenzo thiazole (34.0 g) respectively were used.
• the resultant compounds had similar properties to those of the compound of Example 8.
• the resultant polymer was redissolved in NMP (150 ml) and the solution was added slowly to a refluxing solution of conc. H 2 SO 4 (40 g) in water (200 ml). The mixture was boiled for 21/2 hours and was then cooled to room temperature.
• the hydrolysed polymer solution from Stage B was cooled below 5° C. (ice-water bath) and a solution of sodium nitrite (8.3 g) in water (40 ml) was added. The mixture was stirred for 1 hour at 1°-2° C. and then excess nitrite was destroyed by addition of sulphamic acid.
• DBSA paste (68 g) was dissolved in water (3 l) and the diazo polymer solution was poured in slowly with vigorous stirring. The precipitated polymer was collected by filtration, washed thoroughly with cold water and dried in vacuo at room temperature.
• the polymer solution was added slowly to a refluxing solution of H 2 SO 4 (87 ml) in water (1). A dark coloured solution gradually formed and refluxing was continued for 21/2 hours. The reaction mixture was then cooled to room temperature.
• the hydrolysed polymer solution from Stage B was cooled below 5° C. by immersion in an ice bath and by the addition of ice to the solution.
• Sodium nitrite (33.12 g) in water (160 ml) was added with stirring. After 1 hour, excess nitrite was destroyed by the addition of sulphamic acid.
• DBSA paste (300 g) was dissolved in cold water (12) and the diazotised polymer solution from Stage C was slowly poured in. After warming gradually to 25° C. and stirring overnight, the polymer coagulated. The product was collected by filtration, washed thoroughly with cold water and dried in vacuo. Yield 365 g.
• the hydrolysed polymer solution was cooled below 5° C. by immersion in an ice bath. A solution of sodium nitrite (4.56 g) in water (10 ml) was added with stirring. After 1 hour, excess nitrite was destroyed by the addition of sulphamic acid.
• DBSA paste (20.6 g) was dissolved in cold water (1.2) and the diazotised polymer solution was slowly poured in. After warming gradually to 30° C. and stirring for 30 min., the polymer coagulated. The product was collected by filtration, washed thoroughly with cold water and dried in vacuo. Yield 34.2 g.
• NMP 50 ml was heated to 95° C. (oil bath), under an atmosphere of nitrogen, and a solution containing methyl methacrylate (6.0 g), m-TMI (6.0 g), lauryl methacrylate (2.5 g) and AIBN (0.78 g) in NMP (10.5 ml) was added dropwise over 2 hours. The solution was then stirred at 95° C. for a further 2 hours, and was then cooled to room temperature.
• EHAA (4.0 g), sufficient to react with 2/3 of the available isocyanate groups in the terpolymer, was dissolved in NMP (15 ml) and 1 drop of dibutyl tin dilaurate was added. The terpolymer solution was added to this solution, heated to 50° C., and the mixture was stirred for 3 hours. In order to effect conversion of the remaining isocyanate groups, a solution of 4-aminophenylacetic acid sodium salt (1.7 g) in NMP (10 ml) was added quickly and the mixture was stirred at 50° C. for 2 hours.
• the polymer solution was added to a refluxing solution of conc. H 2 SO 4 (12 g) in water (75 ml) over 5 min. Reflux was maintained for a further 21/2 hours to effect hydrolysis.
• the hydrolysed polymer solution was cooled by the addition of ice (10 g) and was then immersed in an ice bath. With the temperature at 0°-3° C., sodium nitrite (1.66 g) in water (8 ml) was added with stirring. After 1 hour, excess nitrite was destroyed by the addition of sulphamic acid.
• the solutions were whirler coated onto grained and anodised aluminium and the resulting radiation sensitive plates were dried in an oven at 100° C. for 2 min.
• the plates were then imagewise exposed beneath a continuous tone step-wedge in a vacuum frame and developed with an aqueous solution containing 10% anionic surfactant and 2% benzyl alcohol to obtain lithographic printing plates.
• m-TMI is m-isopropyl- ⁇ , ⁇ -dimethylbenzyl isocyanate
• MM is methyl methacrylate
• MAA is methacrylic acid
• LM is lauryl methacrylate
• SM is stearyl methacrylate.
• polymers containing pendant carboxylic acid groups showed improved development characteristics when incorporated in printing plates.
• the carboxylic acid groups in polymer No. 27 are derived from the amino acid used in Stage B).
• polymer No. 23 gave a plate which showed a residual stain after development.
• polymer No. 27 afforded a plate which showed no residual stain.
• the diazo content of the two polymers taken as the UV absorbance of a 0.002% w/v solution at 380 nm, was the same (0.43), but polymer No. 27 contained additional carboxylic acid groups.

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• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• General Physics & Mathematics (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
• Laminated Bodies (AREA)
• Polyurethanes Or Polyureas (AREA)
• Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
• Photoreceptors In Electrophotography (AREA)
• Thermistors And Varistors (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
• Glass Compositions (AREA)
• Compositions Of Oxide Ceramics (AREA)

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Citations (6)

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• 1986
  • 1986-02-12 GB GB868603405A patent/GB8603405D0/en active Pending
• 1987
  • 1987-02-09 EP EP87301088A patent/EP0233072B1/en not_active Expired - Lifetime
  • 1987-02-09 DE DE8787301088T patent/DE3781422T2/de not_active Expired - Fee Related
  • 1987-02-09 ES ES198787301088T patent/ES2035039T3/es not_active Expired - Lifetime
  • 1987-02-09 AT AT87301088T patent/ATE80232T1/de not_active IP Right Cessation
  • 1987-02-10 ZA ZA87952A patent/ZA87952B/xx unknown
  • 1987-02-10 NZ NZ219229A patent/NZ219229A/xx unknown
  • 1987-02-10 CA CA000529388A patent/CA1326101C/en not_active Expired - Fee Related
  • 1987-02-11 NO NO870547A patent/NO167583C/no unknown
  • 1987-02-12 JP JP62030623A patent/JP2545219B2/ja not_active Expired - Lifetime
  • 1987-02-12 FI FI870601A patent/FI87609C/fi not_active IP Right Cessation
  • 1987-02-12 AU AU68723/87A patent/AU588426B2/en not_active Ceased
• 1989
  • 1989-01-19 US US07/300,699 patent/US4902601A/en not_active Expired - Lifetime
• 1992
  • 1992-09-03 GR GR920401893T patent/GR3005593T3/el unknown

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